Vehicle Detection

Udacity SDCND Term1 Project 5

The goals / steps of this project are the following:

  • Perform a Histogram of Oriented Gradients (HOG) feature extraction on a labeled training set of images and train a classifier Linear SVM classifier
  • Optionally, you can also apply a color transform and append binned color features, as well as histograms of color, to your HOG feature vector.
  • Implement a sliding-window technique and use the trained classifier to search for vehicles in images.
  • Run the pipeline on a video stream and create a heat map of recurring detections frame by frame to reject outliers and follow detected vehicles.
  • Estimate a bounding box for vehicles detected.

Imports

In [1]:
import glob
import time
import cv2
import numpy as np
from sklearn.svm import LinearSVC
from skimage.feature import hog
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
from sklearn.preprocessing import StandardScaler
from sklearn.model_selection import train_test_split
from scipy.ndimage.measurements import label
from moviepy.editor import VideoFileClip
from IPython.display import HTML
from collections import deque
import warnings
warnings.filterwarnings("ignore")
%matplotlib inline

Load in images

  1. Loads in a few test images, what will be used to validate the trained classifier near the end of the notebook
  2. Loads in the filename of all images used to train the car classifier
  3. Loads in the filename of all non car images used to train the classifier
In [2]:
test_images = glob.glob('test_images/*.jpg')
cars = glob.glob('vehicles/**/*.png')
notcars = glob.glob('non-vehicles/**/*.png')

#print (len(cars))
#print (len(notcars))
#print (len(test_images))

Visualize images from each set

In [3]:
# Just for fun choose random car / not-car indices and plot example images   
car_ind = np.random.randint(0, len(cars))
notcar_ind = np.random.randint(0, len(notcars))
    
# Read in car / not-car images
car_image = mpimg.imread(cars[car_ind])
notcar_image = mpimg.imread(notcars[notcar_ind])

# Plot the examples
fig = plt.figure()
plt.figure(figsize=(20,20))
plt.subplot(121)
plt.imshow(car_image)
plt.title('Example Car Image',fontsize=20)
plt.subplot(122)
plt.imshow(notcar_image)
plt.title('Example Not-car Image',fontsize=20)
plt.savefig('output_images/Examples.png')
<matplotlib.figure.Figure at 0x7f76f8e19710>

Function block

In [4]:
def convert_color(img, conv='RGB2YCrCb'):
    if conv == 'RGB2YCrCb':
        return cv2.cvtColor(img, cv2.COLOR_RGB2YCrCb)
    if conv == 'BGR2YCrCb':
        return cv2.cvtColor(img, cv2.COLOR_BGR2YCrCb)
    if conv == 'RGB2LUV':
        return cv2.cvtColor(img, cv2.COLOR_RGB2LUV)
    if conv == 'RGB2HSV':
        return cv2.cvtColor(img,cv2.COLOR_RGB2HSV)

# Essentially a resize function
def bin_spatial(img, size=(32, 32)):
    color1 = cv2.resize(img[:, :, 0], size).ravel()
    color2 = cv2.resize(img[:, :, 1], size).ravel()
    color3 = cv2.resize(img[:, :, 2], size).ravel()
    return np.hstack((color1, color2, color3))


def color_hist(img, nbins=32):    #bins_range=(0, 256)
    # Compute the histogram of the color channels separately
    channel1_hist = np.histogram(img[:,:,0], bins=nbins)
    channel2_hist = np.histogram(img[:,:,1], bins=nbins)
    channel3_hist = np.histogram(img[:,:,2], bins=nbins)
    # Concatenate the histograms into a single feature vector
    hist_features = np.concatenate((channel1_hist[0], channel2_hist[0], channel3_hist[0]))
    # Return the individual histograms, bin_centers and feature vector
    return hist_features

def draw_boxes(img, bboxes, color=(0, 0, 255), thick=6):
    # Make a copy of the image
    imcopy = np.copy(img)
    # Iterate through the bounding boxes
    for bbox in bboxes:
        # Draw a rectangle given bbox coordinates
        cv2.rectangle(imcopy, bbox[0], bbox[1], color, thick)
    # Return the image copy with boxes drawn
    return imcopy

def get_hog_features(img, orient, pix_per_cell, cell_per_block, 
                        vis=False, feature_vec=True):
    # Call with two outputs if vis==True
    if vis == True:
        features, hog_image = hog(img, orientations=orient, 
                                  pixels_per_cell=(pix_per_cell, pix_per_cell),
                                  cells_per_block=(cell_per_block, cell_per_block), 
                                  transform_sqrt=False, 
                                  visualise=vis, feature_vector=feature_vec)
        return features, hog_image
    # Otherwise call with one output
    else:      
        features = hog(img, orientations=orient, 
                       pixels_per_cell=(pix_per_cell, pix_per_cell),
                       cells_per_block=(cell_per_block, cell_per_block), 
                       transform_sqrt=False, 
                       visualise=vis, feature_vector=feature_vec)
        return features
    
# Define a function to extract features from a list of images
# Have this function call bin_spatial() and color_hist()
def extract_features(imgs, color_space='RGB', spatial_size=(32, 32),
                        hist_bins=32, orient=9, 
                        pix_per_cell=8, cell_per_block=2, hog_channel=0,
                        spatial_feat=True, hist_feat=True, hog_feat=True):
    # Create a list to append feature vectors to
    features = []
    # Iterate through the list of images
    for file in imgs:
        file_features = []
        # Read in each one by one
        image = mpimg.imread(file)
        # apply color conversion if other than 'RGB'
        if color_space != 'RGB':
            if color_space == 'HSV':
                feature_image = cv2.cvtColor(image, cv2.COLOR_RGB2HSV)
            elif color_space == 'LUV':
                feature_image = cv2.cvtColor(image, cv2.COLOR_RGB2LUV)
            elif color_space == 'HLS':
                feature_image = cv2.cvtColor(image, cv2.COLOR_RGB2HLS)
            elif color_space == 'YUV':
                feature_image = cv2.cvtColor(image, cv2.COLOR_RGB2YUV)
            elif color_space == 'YCrCb':
                feature_image = cv2.cvtColor(image, cv2.COLOR_RGB2YCrCb)
        else: feature_image = np.copy(image)      

        if spatial_feat == True:
            spatial_features = bin_spatial(feature_image, size=spatial_size)
            file_features.append(spatial_features)
        if hist_feat == True:
            # Apply color_hist()
            hist_features = color_hist(feature_image, nbins=hist_bins)
            file_features.append(hist_features)
        if hog_feat == True:
        # Call get_hog_features() with vis=False, feature_vec=True
            if hog_channel == 'ALL':
                hog_features = []
                for channel in range(feature_image.shape[2]):
                    hog_features.append(get_hog_features(feature_image[:,:,channel], 
                                        orient, pix_per_cell, cell_per_block, 
                                        vis=False, feature_vec=True))
                hog_features = np.ravel(hog_features)        
            else:
                hog_features = get_hog_features(feature_image[:,:,hog_channel], orient, 
                            pix_per_cell, cell_per_block, vis=False, feature_vec=True)
            # Append the new feature vector to the features list
            file_features.append(hog_features)
        features.append(np.concatenate(file_features))
    # Return list of feature vectors
    return features


def find_cars(img, ystart, ystop, scale,
              svc, X_scaler, color_space,
              orient, pix_per_cell,
              cell_per_block, hog_channel,
              spatial_size,
              hist_bins, xlimit,all_rectangles=False):
    '''Extracts features from image and trains SVM model on those features.
    '''
    draw_img = np.copy(img)
    img = img.astype(np.float32) / 255
    rectangles = []
    
    img_tosearch = img[ystart:ystop, :, :]
    ctrans_tosearch = convert_color(img_tosearch, conv='RGB2'+color_space)
    if scale != 1:
        imshape = ctrans_tosearch.shape
        ctrans_tosearch = cv2.resize(ctrans_tosearch, (np.int(imshape[1] / scale), np.int(imshape[0] / scale)))

    ch1 = ctrans_tosearch[:, :, 0]
    ch2 = ctrans_tosearch[:, :, 1]
    ch3 = ctrans_tosearch[:, :, 2]

    # Define blocks and steps as above
    nxblocks = (ch1.shape[1] // pix_per_cell) +1
    nyblocks = (ch1.shape[0] // pix_per_cell) -1
    nfeat_per_block = orient * cell_per_block ** 2
    
    # 64 was the orginal sampling rate, with 8 cells and 8 pix per cell
    window = 64
    nblocks_per_window = (window // pix_per_cell) - 1
    cells_per_step = 2  # Instead of overlap, define how many cells to step
    nxsteps = (nxblocks - nblocks_per_window) // cells_per_step
    nysteps = (nyblocks - nblocks_per_window) // cells_per_step

    # Compute individual channel HOG features for the entire image
    if hog_channel == 'ALL':
        hog1 = get_hog_features(ch1, orient, pix_per_cell, cell_per_block, feature_vec=False)
        hog2 = get_hog_features(ch2, orient, pix_per_cell, cell_per_block, feature_vec=False)
        hog3 = get_hog_features(ch3, orient, pix_per_cell, cell_per_block, feature_vec=False)
    else:
        hog1 = get_hog_features(hog_channel, orient, pix_per_cell, cell_per_block, feature_vec=False)
    
    
    for xb in range(xlimit,nxsteps):
        for yb in range(nysteps):
            
            ypos = yb * cells_per_step
            xpos = xb * cells_per_step
            
            hog_feat1 = hog1[ypos:ypos + nblocks_per_window, xpos:xpos + nblocks_per_window].ravel()
            if hog_channel == 'ALL':
                hog_feat2 = hog2[ypos:ypos + nblocks_per_window, xpos:xpos + nblocks_per_window].ravel()
                hog_feat3 = hog3[ypos:ypos + nblocks_per_window, xpos:xpos + nblocks_per_window].ravel()
                hog_features = np.hstack((hog_feat1, hog_feat2, hog_feat3))
            else:
                hog_features = hog_feat1

            xleft = xpos * pix_per_cell
            ytop = ypos * pix_per_cell

            subimg = cv2.resize(ctrans_tosearch[ytop:ytop + window, xleft:xleft + window], (64, 64))

            spatial_features = bin_spatial(subimg, size=spatial_size)
            hist_features = color_hist(subimg, nbins=hist_bins)

            test_features = X_scaler.transform(
                np.hstack((spatial_features, hist_features, hog_features)).reshape(1, -1))
            
            test_prediction = svc.predict(test_features)

            if test_prediction == 1 or all_rectangles:
                xbox_left = np.int(xleft * scale)
                ytop_draw = np.int(ytop * scale)
                win_draw = np.int(window * scale)
                # It is best to save regions for now
                rectangles.append(((xbox_left, ytop_draw + ystart),
                                   (xbox_left + win_draw, ytop_draw + win_draw + ystart)))

    return rectangles

Visualize HOG features

In [5]:
# Create random index point for each list of car and notcars filename
car_ind = np.random.randint(0, len(cars))
notcar_ind = np.random.randint(0, len(notcars))
    
# Read in image from cars,notcars list using random indices from above
car_img = mpimg.imread(cars[car_ind])
noncar_img = mpimg.imread(notcars[notcar_ind])

# Create hog for the random images selected
features,car_dst = get_hog_features(car_img[:,:,2], 9, 8, 8, vis=True, feature_vec=True)
features,noncar_dst = get_hog_features(noncar_img[:,:,2], 9, 8, 8, vis=True, feature_vec=True)

# Visualize 
f, ((ax1, ax2), (ax3, ax4)) = plt.subplots(2, 2, figsize=(20,20))
ax1.imshow(car_img)
ax1.set_title('Car Image', fontsize=20)
ax2.imshow(car_dst, cmap='gray')
ax2.set_title('Car HOG', fontsize=20)
ax3.imshow(noncar_img)
ax3.set_title('Non-Car Image', fontsize=20)
ax4.imshow(noncar_dst, cmap='gray')
ax4.set_title('Non-Car HOG', fontsize=20)
Out[5]:
<matplotlib.text.Text at 0x7f76f8b199e8>

Feature extraction for model

In [6]:
# Define the settings used for the feature extraction
color_space='YCrCb'
orient=8
pix_per_cell=8
cell_per_block=2
hog_channel='ALL'
spatial_size=(32, 32)
hist_bins=32
spatial_feat=True
hist_feat=True
hog_feat=True

t=time.time()
## Extract the features for all the car and not car images
car_features = extract_features(cars, color_space=color_space, spatial_size=spatial_size,
                                hist_bins=hist_bins, orient=orient, pix_per_cell=pix_per_cell,
                                cell_per_block=cell_per_block, hog_channel=hog_channel,
                                spatial_feat=spatial_feat, hist_feat=hist_feat, hog_feat=hog_feat)

notcar_features = extract_features(notcars, color_space=color_space, spatial_size=spatial_size,
                                   hist_bins=hist_bins, orient=orient, pix_per_cell=pix_per_cell,
                                   cell_per_block=cell_per_block, hog_channel=hog_channel,
                                   spatial_feat=spatial_feat, hist_feat=hist_feat, hog_feat=hog_feat)
t2 = time.time()
print(round(t2-t, 5), 'Seconds to extract features')
57.27859 Seconds to extract features

Normalize and split dataset into testing and training set, then train the classifier

In [7]:
# Create an array stack of feature vectors
X = np.vstack((car_features, notcar_features)).astype(np.float64)  
# Fit a per-column scaler
X_scaler = StandardScaler().fit(X)
# Apply the scaler to X
scaled_X = StandardScaler().fit(X).transform(X)
# Define the labels vector
y = np.hstack((np.ones(len(car_features)), np.zeros(len(notcar_features))))

# Split up data into randomized training and test sets
# Use 20% test size

rand_state=np.random.randint(0,100)
X_train, X_test, y_train, y_test = train_test_split(scaled_X, y, test_size=0.2, random_state=rand_state)

print('Using spatial binning of:',spatial_size,
    'and', hist_bins,'histogram bins')
print('Feature vector length:', len(X_train[0]))

# Use a linear SVC 
svc = LinearSVC()

# Check the training time for the SVC
t=time.time()
svc.fit(X_train, y_train)
t2 = time.time()
print(round(t2-t, 2), 'Seconds to train SVC...')

# Check the score of the SVC
print('Test Accuracy of SVC = ', round(svc.score(X_test, y_test), 4))

# Check the prediction time for a single sample
t=time.time()
n_predict = 10
print('My SVC predicts: ', svc.predict(X_test[0:n_predict]))
print('For these',n_predict, 'labels: ', y_test[0:n_predict])
t2 = time.time()
print(round(t2-t, 5), 'Seconds to predict', n_predict,'labels with SVC')
Using spatial binning of: (32, 32) and 32 histogram bins
Feature vector length: 7872
13.71 Seconds to train SVC...
Test Accuracy of SVC =  0.9896
My SVC predicts:  [ 1.  1.  1.  1.  1.  1.  0.  1.  1.  1.]
For these 10 labels:  [ 1.  1.  1.  1.  1.  1.  0.  1.  1.  1.]
0.00155 Seconds to predict 10 labels with SVC

Show all potential search areas

The code block illustrates the overlapping regions that is being used to search for a car

In [8]:
img = mpimg.imread('test_images/test6.jpg')

rects = []
y_start= [400,425,400,450,500,425]
y_stop = [500,550,600,650,700,725]
scale  = [1.0,1.25,1.5,2.0,2.5,3.0]
xlimit = [40,30,25,17,15,10]
num=1
fig= plt.figure(figsize=(20,20))

# Iterate in parallel y_start,y_stop_,scale. Draw each square regardless of detection

for ystart,ystop,scale,xlim in zip(y_start,y_stop,scale,xlimit):
    rect=find_cars(img, ystart, ystop, scale, svc,
                            X_scaler, color_space, orient,
                            pix_per_cell, cell_per_block, hog_channel,
                            spatial_size, hist_bins,xlim,all_rectangles=True)
    plot=draw_boxes(img,rect,thick=2)
    ax=fig.add_subplot(3,2,num,autoscale_on=True)
    ax.imshow(plot)
    ax.set_title('Region '+str(num),fontsize=40)
    rects.append(rect)
    num=num+1
plt.tight_layout()
plt.show()

Regions that have detected a car

Note that not all regions overlap the cars in this specific test image, which is why Regions 4-6 have no boundary boxes in the image.

In [9]:
img = mpimg.imread('test_images/test6.jpg')

rects = []

# same settings as previous block, redundant, but used to clarify what is going on
y_start= [400,425,400,450,500,425]
y_stop = [500,550,600,650,700,725]
scale  = [1.0,1.25,1.5,2.0,2.5,3.0]
xlimit =  [40,30,25,17,15,10]

# Iterate in parallel y_start,y_stop_,scale. This time only drawing the rectangles that detect a car
num=1
fig= plt.figure(figsize=(20,20))
for ystart,ystop,scale,xlim in zip(y_start,y_stop,scale,xlimit):
    rect=find_cars(img, ystart, ystop, scale, svc,
                            X_scaler, color_space, orient,
                            pix_per_cell, cell_per_block, hog_channel,
                            spatial_size, hist_bins,xlim,all_rectangles=False)
    plot=draw_boxes(img,rect,color=(0,255,0),thick=2)
    ax=fig.add_subplot(3,2,num,autoscale_on=True)
    ax.imshow(plot)
    # If there are no boxes in rect then there were no cars detected in the region
    if len(rect)==0:
        detected='False'
    else:
        detected='True'
    ax.set_title('Region '+str(num)+' Car detected= '+detected,fontsize=40)
    rects.append(rect)
    num=num+1
plt.tight_layout()
plt.show()

Closer look at Region 3

For this test image, region 3 seems to detect the cars in the image well.

In [36]:
y_start = 400
y_stop = 600
scale = 1.5
xlimit =25

car_windows =find_cars(img, ystart, ystop, scale, svc,
                        X_scaler, color_space, orient,
                        pix_per_cell, cell_per_block, hog_channel,
                        spatial_size, hist_bins,xlim,all_rectangles=False)
test_img_rects = draw_boxes(img, car_windows,color=(255,0,0),thick=2)
plt.figure(figsize=(20,20))
plt.imshow(test_img_rects)
plt.title('Squares Detecting Car',fontsize=40)
Out[36]:
<matplotlib.text.Text at 0x7f76f833bbe0>

Add heat maps based on rectangles with car detected

In [14]:
def add_heat(heatmap, bbox_list):
    # Iterate through list of bboxes
    for box in bbox_list:
        # Add += 1 for all pixels inside each bbox
        # Assuming each "box" takes the form ((x1, y1), (x2, y2))
        heatmap[box[0][1]:box[1][1], box[0][0]:box[1][0]] += 1

    # Return updated heatmap
    return heatmap

Plot the heatmap

In [16]:
rects = []
y_start= [400,425,400,450,500,425]
y_stop = [500,550,600,650,700,725]
scale= [1.0,1.25,1.5,2.0,2.5,3.0]
xlimit =  [40,30,25,17,15,10]

# Iterate in parallel y_start,y_stop_,scale. This time only passing the rectangle valus to the add_heat function
for ystart,ystop,scale,xlim in zip(y_start,y_stop,scale,xlimit):
    rects.append(find_cars(img, ystart, ystop, scale, svc,
                            X_scaler, color_space, orient,
                            pix_per_cell, cell_per_block, hog_channel,
                            spatial_size, hist_bins,xlim))

rectangles = [item for sublist in rects for item in sublist]

heatmap_img = np.zeros_like(img[:,:,0])
heatmap_img = add_heat(heatmap_img, rectangles)
plt.figure(figsize=(25,25))
plt.imshow(heatmap_img, cmap='hot')
plt.title('Car Positions',fontsize=40)
Out[16]:
<matplotlib.text.Text at 0x7f76f871ba20>

Apply a threshold to the heatmap to filter false positives.

In [17]:
def apply_threshold(heatmap, threshold):
    # Zero out pixels below the threshold
    heatmap[heatmap <= threshold] = 0
    # Return thresholded map
    return heatmap

Filtering the heatmap

  1. The edges of the heatmap are the most noticeable difference.
  2. It has been observed that when training the classifer it has created false positives in the middle of the current lane. The threshold operation is a good countermeasure to reduce this chance in the final heatmap
In [18]:
#Apply threshold and to filter false positives
#np.set_printoptions(suppress=True)
threshed_heatmap_img = apply_threshold(heatmap_img, 2)
plt.figure(figsize=(25,25))
plt.imshow(threshed_heatmap_img, cmap='hot')
plt.title('Threshed Heat Map',fontsize=40)
Out[18]:
<matplotlib.text.Text at 0x7f76f860c160>

Apply scipy labels to heatmap

In [19]:
labels = label(threshed_heatmap_img)
plt.figure(figsize=(25,25))
plt.imshow(labels[0], cmap='gray')
plt.title('Identify and label cars',fontsize=40)
print(labels[1], 'cars found')
2 cars found
In [20]:
def draw_labeled_bboxes(img, labels):
    # Iterate through all detected cars
    for car_number in range(1, labels[1]+1):
        # Find pixels with each car_number label value
        nonzero = (labels[0] == car_number).nonzero()
        # Identify x and y values of those pixels
        nonzeroy = np.array(nonzero[0])
        nonzerox = np.array(nonzero[1])
        # Define a bounding box based on min/max x and y
        bbox = ((np.min(nonzerox), np.min(nonzeroy)), (np.max(nonzerox), np.max(nonzeroy)))
        # Draw the box on the image
        cv2.rectangle(img, bbox[0], bbox[1], (0,0,255), 6)
    # Return the image and final rectangles
    return img, rects

# Draw bounding boxes on a copy of the image
draw_img, rect = draw_labeled_bboxes(np.copy(img), labels)
# Display the image
fig=plt.figure()
plt.figure(figsize=(32,24))
plt.subplot(1,2,1)
plt.imshow(draw_img)
plt.title('Car Detected',fontsize=40)
plt.subplot(1,2,2)
plt.imshow(heatmap_img,cmap='hot')
plt.title('Heat Map',fontsize=40)
plt.savefig('output_images/plotcompare.png')
<matplotlib.figure.Figure at 0x7f76f86f77b8>

Vehicle detection pipeline single image

In [23]:
#This pipeline is for single images.


def vehicle_detection_pipeline(img):
    rects = []
    y_start = [400,425,400,450,500,425]
    y_stop  = [500,550,600,650,700,725]
    scale   = [1.0,1.25,1.5,2.0,2.5,3.0]
    xlimit =  [40,30,25,17,15,10]

    # Iterate in parallel y_start,y_stop_,scale. This time only passing the rectangle valus to the add_heat function
    for ystart,ystop,scale,xlim in zip(y_start,y_stop,scale,xlimit):
        rects.append(find_cars(img, ystart, ystop, scale, svc,
                                X_scaler, color_space, orient,
                                pix_per_cell, cell_per_block, hog_channel,
                                spatial_size, hist_bins,xlim))

    rectangles = [item for sublist in rects for item in sublist]
    
    heatmap_img = np.zeros_like(img[:,:,0])
    heatmap_img = add_heat(heatmap_img, rectangles)
    heatmap_img = apply_threshold(heatmap_img, 3)
    labels = label(heatmap_img)
    draw_img, rect = draw_labeled_bboxes(np.copy(img), labels)
    
    return draw_img

Detect cars on test images

In [24]:
fig = plt.figure(figsize=(20,16))
f.tight_layout()
for i in range(len(test_images)):
    _img = mpimg.imread(test_images[i])
    test_img=vehicle_detection_pipeline(_img)
    ax=fig.add_subplot(3,2,i+1)
    ax.imshow(test_img)
    ax.set_title('Test Image '+str(i+1),fontsize=20)
plt.show()

Vehicle detection pipeline for video

In [42]:
#Similar to the single image pipeline but this incorporates memory system that remembers the last 8 frames
prev_frames=deque(maxlen=8)

def vehicle_detection_pipeline_video(img):
    rects = []
    y_start = [410,400,425,400,450,500,425]
    y_stop  = [460,500,550,600,650,700,725]
    scale   = [1.15,1.0,1.25,1.5,2.0,2.5,3.0]
    xlimit =  [40,30,25,17,15,10]
    start=time.time()
    for ystart,ystop,scale,xlim in zip(y_start,y_stop,scale,xlimit):
        rects.append(find_cars(img, ystart, ystop, scale, svc,
                                X_scaler, color_space, orient,
                                pix_per_cell, cell_per_block, hog_channel,
                                spatial_size, hist_bins,xlim))

    rectangles = [item for sublist in rects for item in sublist]
    
    heatmap_img = np.zeros_like(img[:,:,0])
    heatmap_img = add_heat(heatmap_img, rectangles)
    heatmap_img = apply_threshold(heatmap_img, 3) # threshold op1
    
    prev_frames.append(heatmap_img)#add current heatmap to memory
    heatmap_img=sum(prev_frames)# calc new heatmap_img that uses last 8 frames
    
    heatmap_img = apply_threshold(heatmap_img,2) # threshold op2
    labels = label(heatmap_img)
    draw_img, rect = draw_labeled_bboxes(np.copy(img), labels)
    end=time.time()
    print('Seconds between frames ',round(end-start,5))
    return draw_img

Find cars in project video

In [43]:
output = 'Proj_5.mp4'
clip_test = VideoFileClip('project_video.mp4')#.subclip(10,30)
clip_test_out = clip_test.fl_image(vehicle_detection_pipeline_video)
%time clip_test_out.write_videofile(output, audio=False)
Seconds between frames  0.45405
[MoviePy] >>>> Building video Proj_5.mp4
[MoviePy] Writing video Proj_5.mp4
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[MoviePy] Done.
[MoviePy] >>>> Video ready: Proj_5.mp4 

CPU times: user 21min 16s, sys: 3.39 s, total: 21min 20s
Wall time: 10min 15s
In [44]:
HTML("""
<video width="960" height="540" controls>
  <source src="{0}">
</video>
""".format(output))
Out[44]:
In [ ]: